United States. Bureau of Economic Analysis. "Gross Domestic Product: Fourth Quarter 2005 (Preliminary) : Technical Note, BEA 06-05,"
Bureau of Economic Analysis (BEA) News Releases
(February 28, 2006).
https://fraser.stlouisfed.org/title/6148/item/598016/content/pdf/bea_newsreleases_20060228_technical-note, accessed on June 12, 2025.